Substituted 2-keto-1,4-diazacycloalkanes

Details Substituted 2-keto-1,4-diazacycloalkanes Substituted 2-keto-1,4-diazacycloalkanes

1982-06-17

1984-08-21

Bond, Robert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

544231, 544349, 544354, 2602393B, 2602393P, 2602393T, 544383, 544384, 544313, C07D40112, C07D40312

Patent

active

044669160

ABSTRACT:
Novel polysubstituted 2-keto-1,4-diazacycloalkanes are powerful stabilizers for materials subject to ultraviolet (UV) light degradation, particularly for polyolefins. The cyclic 2-keto compounds of this invention have (a) a fixed two-carbon bridge between the N.sup.1 and N.sup.4 atoms of the diaza ring, the remaining portion of the ring having a variable length bridge of two or more carbon atoms, (b) and N-adjacent carbonyl in the fixed two-carbon bridge, and (c) at least one N.sup.4 -adjacent carbon atom of the diaza ring is polysubstituted, that is, has two substituents which may be cyclizable.
Compositions containing (a) the polysubstituted 2-keto-1,4-diazacycloalkanes of this invention, and (b) prior art polysubstituted 2-keto-1,4-diazacycloalkanes, exhibit excellent stability to UV light.

REFERENCES:
patent: 4292240 (1981-09-01), Lai et al.

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